Right now I'm using white 1/2" Styrofoam sheets I've read they are 85% reflective. Mylar film takes you up to 97%. For some weird reason I don't understand aluminum foil is the same refractivity as white and flat white works better than gloss.

Mylar is not cheap on rolls but, Space Blackets are cheap and they are made of Maylar. My next MOD will be to wrap my panels with a space blanket. In a bigger system like yours you could simply hang them like shower curtains.

Pretty sweet idea!! I may try that if I can find some at the $1 store. My local dollar does carry space blankets.

I have a few now for emergency. Last winter the heater went out, no heat for two days. I used a spas blanket over there tank to help the tank heater. Worked great, the house got down to 50degrees at night but, the tank water stayed @ 72.

I'd have to think it would cost that much to heat one of the IBC tubes for Tilapia. I'd think most like the same cost as heating your aquariums.

The tubs are filled with 200gals of water. The water is constantly pumped into the growbeds is a big heatloss. I prob need 2 500W heaters per tub to keep the water temp at 80F. I don't feel like investing in heaters.

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